“And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it…” (Genesis:1:28).

How long have people been living on the Earth? The evolutionist says two million years. The Bible-believing Christian says about six thousand. Who is right?

Statistically, a couple must have 2.1 children to keep a population at the same level. In practice, this means a minimum of three children per family. Let us suppose for a moment that the biblical account of the Genesis Flood in which just eight people survived is true. Let us further suppose that each family from this point in history had 2.4 children on average. This very modest number will take into account all the deaths through infant mortality, plagues and war. How long would it take to reach today’s world population? Surprisingly, the answer is just less than five thousand years. This figure fits nicely into known historical records.

Now suppose we take the evolutionary view that mankind has been on this planet for two million years and we begin with two people – or eight, it will make little difference – and they also had the statistical 2.4 children per family. We will finish up with a number so impossibly large that the universe itself would not hold them! Aware of this problem, the textbooks explain it away by speaking of “population stability throughout this time.” This is nothing short of an appeal to a miracle! Frankly, the biblical account is far more believable.

http://www.creationmoments.com/radio/transcripts/population-and-age-earth-0